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<p>This sounds like a carburettor problem (wrong
needles/jets/springs?) where the car is running very lean between
2500 and 3200rpm. Check if there are any vacuum leaks.</p>
<p>Check the advance curve of the distributor, may be a spring from
one or both of the bob weights is loose/broken/missing. <br>
</p>
<p>Check the timing of the cam shaft.<br>
</p>
<p>Mixture, ignition and cam shaft settings can be very different
from the original because of the changes in the engine. It should
really be set up on a rolling road.</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 10-8-2019 om 23:03 schreef Steven
Kingsbury via Healeys:<br>
</div>
<blockquote type="cite"
cite="mid:4b138064-a96e-4926-87a8-a3b000af8be0@me.com">
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<div>To start off, my car, an early BN1, #598 was burned up in the
Paradise fire and I just bought another BN1 to replace it. The
new car has been hot rodded up a bit. Cam, bigger carbs and
different pistons so it has a way different compression ratio
and has been in this configuration for over ten years I believe.
Was told it runs like the wind and came from a reliable and
trust worthy person. Well I'm having problems with the car. Up
to 2500 RPM, it runs great! When I can get it up to 3200 RPM it
runs great again, it's the 2500 to 3200 range where I'm having
problems.</div>
<div> It feels like it's starving for fuel, or it has too much
fuel, it hesitates, feels like it's not running on all
cylinders, and generally like a bucking bronco, but then at 3200
or so, she smooths right out and flies!</div>
<div> I was told the carbs were set up a little rich. I leaned
them out one flat at a time and no difference until they got too
lean and wouldn't run well at all. So I took them back to
original setting positions. </div>
<div> I've checked all gaps, they're all right. Pulled plugs
when getting home and they are all fine, a little brown and all
even looking. New condenser, new coil, changed to new plugs, I
have not checked the timing yet, but with the way it runs below
2500 and above 3000, it seems to be just fine.</div>
<div> I am getting the car up in the air Monday as I have new
tires to replace the old ones and will do a static timing check
at that time. My old four cylinder was a breeze to set up and
ran smooth through all revs. What am I missing with an engine
set up like an M? Why would things go south between 2500 and
3000 and run fine below and above?</div>
<div> All suggestions are welcome and I do have a new fuel pump
on order, so fire away. I've been doing things one step at a
time to not introduce new problems, but this is the only problem
that is consistent.</div>
<div> Thanks,</div>
<div>Steven Kingsbury</div>
<div><br data-mce-bogus="1">
</div>
<br>
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